Blade-tie.



U. E. SWEET.

BLADE TIE.

APPLIOATION FILED MAY 11, 1907.

Patented May 21, 1912.

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WITNESSES:

COLUMBIA PLANOGRAPH Cm. WASHINGTON n c UNITED STATES PATENT OFFICE.

CHARLES E. SWEET, OF WILKINSLBURG, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE COLONIAL TRUST COMPANY, TRUSTEE, 0F PITTSBURGH, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

BLADE-TIE.

Specification of Letters Patent.

Patented May 21, 1912.

To all whom it may concern:

Be it known that I, CHARLES E. Swnn'r, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have made a new and useful Invention in Blade Ties, of which the following is a specification.

This invention relates to combined binding and spacing means for the outer or free ends of blades or vanes such as utilized in elastic fluid turbines, rotary blowers, and like machines.

In machines of the character above outlined it is necessary to employ means for binding and spacing the outer or free ends of the vanes or blades thereof, and it is necessary in designing such binding and spacing means to secure a device which offers a minimum resistance to the fluid translated.

An object, therefore, has been to produce a simple, eflicient and easily assembled means for binding and spacing the outer or free ends of the blades of such devices.

In the drawings accompanying and forming a part of this application the invention is illustrated in conjunction with what may be termed blower blades; that is, blades differing somewhat in form from turbine blades, but it will be understood that the invention is equally applicable to blades of any form or construction.

In the drawings: Figure 1 is a side elevation of four blades secured to a blade holding element and in this View the blades are shown spaced apart by means of a binding member embodying this invention; Fig. 2 is a plan view of the blades and binding member shown in Fig. 1; Fig. 3 is a fragmentary view of a portion of one of the blades illustrated in Figs. 1 and 2, and shows the manner of notching the blades to receive the binding member; Fig. tis a detailed view of the binding member shown in Figs. 1 and 2 prior to its attachment to,

the blades; and Figs. 5, 6 and 7 are views similar toFigs. 1, 3 and 4. respectively of a modified form of the several elements comprised in this invention.

In carrying out this invention blades 8 comprised in an annular row are notched at 9 and 10 as illustrated in Fig. 3. A strip of metal (preferably the same metal as the blades are formed from) of the desired length and width is notched by punching or in any other suitable manner, as shown in Flg. 4,. to provide cut away portions 11, the walls of which partially surround the blades, and tongue portions 12, which are adapted to fit within the holes 10 of the blades. Either in the initial punching operation, whereby the binding strip is formed, or in a subsequent operation the tongue portions 12 are crimped and bent out of the plane of the strip proper as shown at 13 in Fig. 1.

In assembling the spacing members on the blades the members are inserted within the slots 9 of the blades so that the portions of the blades above said slots overhang the binding members as shown in Fig. 2. After the members are in place the tongues 12 are moved into the planes of the members and take positions within the holes 10.

Since portions of each binding member lie below the portions of the blades above slot 9, the binding members are prevented from dislodgment due to centrifugal force and the tongues 12, when bent back to the plane of the member, firmly secure the bind ing members to the blades and prevent lateral motion thereof. It will be readily seen that the blades are accurately spaced apart and a number in one annular row are firmly tied or bound'together whereby vibration is prevented.

In Figs. 5, 6 and '7 a modified form of binding member is shown and in utilizing this form tongues 15 corresponding to tongues 12 are bent out of the plane of the member as shown at 16 in Fig. 5. The holes 17 in the blades corresponding to the holes 10 are made considerably longer than the holes 10 to allow the tongueto be re bent back into the plane of the blades.

In accordance with the provisions of the patent statutes I have described the principle of operation of my invention, together with the means which I now consider to represent the best embodiment thereof, but I desire to have it understood that the means shown is only illustrative and that the invention can be carried out in other Ways.

Having thus described my invention, what I claim as new and useful is:

1. In combination with a plurality of blades comprised in a row and provided with notches and slots to receive and secure in place a binding member, a binding member provided with notches adapted to co operate with the notches of said blades and tips, which when distorted, cooperate with the slots of said blades.

2. A blade provided with a notch in one edge thereof and a perforation substantially the same distance from the end of the blade as but independent of said notch.

3. In combination with a group of blades perforated near one end, a strip lying alongside of said blades and provided with members extending into said perforations.

4. In combination with a group of perforated turbine blades, a binding strip extending along one side of said group and provided with members which engage said perforations from the other side.

5. In combination with a locking strip for the outer or free ends of blades, a blade notched to receive said strip and a slot in said blades coiiperating with a flexible tip on said strip which is distorted when in place for securing said strip to said blades.

6. In combination with a plurality of blades comprised in an annular row, a binder strip for the outer or free ends of the blades, notches cut in the edges of the blades for receiving said strip and tips formed on the strip and distorted when in place to interlock with the blades for securing it in place on said blades.

7. In combination with a plurality of blades comprised in a row, a binder strip provided with notches for receiving the blades, and means distorted when in place and formed integrally with said strip for interlocking engagement with said blades.

8. In combination with a plurality of blades comprised in a rowand notched to receive a binding member, a binding member provided with notches adapted to cooperate with the notches formed in said blades, and means distorted when in place and formed integrally with said member for interlocking engagement with said blades.

9. In combination with a plurality of blades comprised in a row and notched to receive a binding member, a binding member provided with notches adapted to cooperate with the notches of said blades, and a tip on said member and bent when in place for interlocking engagement with the blades,

10. In combination with a plurality of blades comprised in a row and notched to receive a binding member, a binding member provided with notches adapted to cooperate with the notches of said blades, and a plurality of bendable tips formed integrally with said member and bent to cooperate with a slot provided in each of said blades for locking said member in place.

11. In combination With a plurality of blades comprised in a row and provided with a notch for receiving a binding member, and a slot for interlocking said member in place; a binding member provided with notches adapted to cooperate with the notches of said blades, and bent tips adapted to cooperate with the slots of said blades to mount said member and secure it in place.

12. The combination of two members, one of which comprises a spacing member, and the other of which comprises a blade, and distorted means on one member for positive interlocking engagement with the other member intermediate its ends to prevent lateral movement of the engaged member with respect to the engaging member.

13. The combination of two members, one of which comprises connected spacing projections, and the other of which comprises a blade, and distorted means on one member for positive interlocking engagement with the other member.

14. In combination with a group of turbine blades, a spacing member embracing the blades of said group and provided with distorted means which extend between the blades and positively interlock therewith.

15. In combination with a blade, one end of which is notched and provided with a perforation independent of the notch, but substantially the same distance from the end of the blade as the notch, and a binding stripv extending into the notch and into the perforation.

16. In combination with a group of blades each of which is notched and perforated at points distant from one end of the blade, a binding strip extending into the notches, and members on said strip extending into the perforations.

In testimony whereof, I have hereunto subscribed my name this 10th day of May, 1907.

CHARLES E. SWEET.

Witnesses:

CHARLES W. MOGHEE, E. W. MoGALLisTER.

copies or this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

